I came across this intersting variant of the WT588D-16p while sourcing more stable and direct suppies for my boards:
The details page link was broken so dont know mem size but I did send a query about it and now waiting for the reply.
I've not seen a match from any other vendor so it must be manufacturers own take on it.
I like the pin labelling, would make them easy to work with for the absolute novice and would be handy for prototyping purposes. However, not sure why it deserves an $11 price tag though.